Hydrocodone 10-660 mg is a prescription medication that contains 10 milligrams of hydrocodone bitartrate and 660 milligrams of acetaminophen. It is typically used to relieve moderate to severe pain, and it works by blocking the pain signals in the brain. It is important to use this medication only as directed by a healthcare professional, as misuse or abuse can lead to serious side effects or addiction. It is also important to never take more than recommended, as the acetaminophen component can cause liver damage in excess doses.